# Why doesn't timezone work with datetime

9 views (last 30 days)
LR on 24 Aug 2023
Edited: Seth Furman on 14 Sep 2023
I want to convert a posix time to a datetime for the time zone at a specific longitude. The timezone function gives you the time zone at a specific longitude, but none of the outputs are accepted by datetime.
[a,b,c] = timezone(-80)
a = 5
b = 'R'
c = '+5 R'
try
datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',a)
end
try
datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',b)
end
try
datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',c)
end

Star Strider on 24 Aug 2023
The timezone function is from the Mapping Toolbox, and its results are not compatible with the datetime function. The otherwise compatible timezones function does not take longitude arguments.
TZ = string(fix(-80/15)) % Time Zone (-80° Longitude)
TZ = "-5"
Time = datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',TZ)
Time = datetime
31-May-2023 21:04:09
.

Seth Furman on 14 Sep 2023
Edited: Seth Furman on 14 Sep 2023
The value of TimeZone can be an ISO 8601 character vector of the form +HH:mm or -HH:mm; for example, '+01:00', to specify a time zone that is a fixed offset from UTC.
lon = 80;
zd = timezone(lon)
zd = -5
tz = compose("%+03d:00",zd)
tz = "-05:00"
dt = datetime(1685585049.879,ConvertFrom="posixtime",TimeZone=tz)
dt = datetime
31-May-2023 21:04:09

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